Code
P00A6
Generic
P — Powertrain
Intake Air Temperature Sensor 2 Circuit Range/Performance Bank 2
Views:
UK: 32
EN: 34
RU: 33
AI status
Completed
Completed
100%
Causes
- Faulty IAT sensor 2 (Bank 2)
- Open or short in IAT sensor wiring or connector
- Poor electrical connector contact (corrosion, bent pins, water ingress)
- Damaged wiring harness (rub through, chafing, rodent damage)
- Faulty ECM or internal reference/ground fault
- Intake system air leak or sensor exposed to abnormal conditions (water, oil)
Symptoms
- MIL (Check Engine Light) illuminated
- Incorrect intake air temperature displayed in live data or freeze frame
- Engine may run rich/lean or have poor idle control, hesitation or reduced fuel economy
- Hard starting when intake air temperature reading is incorrect
- Possible increased emissions or failed emissions test
What to check
- Read and record freeze frame and stored data with a scan tool; note IAT sensor 2 (Bank 2) value and compare to ambient/other IAT(s)
- Check for other stored codes (especially related temperature/MAF/map)
- Visually inspect IAT sensor 2 and harness for damage, oil/water contamination, loose or corroded connector pins
- Backprobe sensor connector; wiggle harness while watching live data for intermittent behavior
- Measure reference voltage from ECU at connector (typically 5 V) and ground continuity to ECU
- Measure IAT sensor signal voltage at connector and compare to expected reference/temperature
Signal parameters
- Sensor type: typically 2-wire NTC thermistor (resistance falls as temperature rises)
- ECM reference: typically 5 V pull-up from ECM (varies by vehicle)
- Signal range: 0–5 V (varies by vehicle and temperature)
- Typical resistance examples (manufacturer-specific): -40°C: very high (tens to >100 kΩ), 0°C: high (tens of kΩ), 25°C: ~5–15 kΩ, 100°C: ~0.5–2 kΩ
- Expected behavior: measured sensor voltage should change progressively with ambient temperature and track other intake/ambient sensors; sudden jumps, stuck high/low, or out-of-range voltages indicate a fault
Diagnostic algorithm
- Retrieve DTCs, freeze frame and live data. Confirm P00A6 is current and note reported IAT2 (Bank 2) temperature and signal voltage.
- Visually inspect sensor and harness for damage, contamination, loose connector or water entry. Repair obvious issues and retest.
- With ignition ON (engine off), backprobe connector: verify ECM reference voltage (typically ~5 V) and good ground. If reference/ground missing, trace wiring to ECM.
- Measure sensor signal voltage while warming/cooling sensor by hand or with ambient air. The voltage should change smoothly. If stuck high or low, suspect open/short or bad sensor.
- With connector disconnected, measure sensor resistance across its terminals and compare to expected thermistor curve or manufacturer spec. Replace the sensor if resistance is out of expected range.
- If wiring, connector and sensor test good, perform wiggle tests while monitoring live data to find intermittent opens/shorts. Repair wiring as needed.
- If all wiring and sensor test OK, check ECM input circuit operation. Swap with a known-good identical sensor (if accessible) or consult manufacturer for ECM bench tests before replacing ECM.
- Clear codes and road test to verify the repair. Re-scan for return codes and proper IAT2 behavior.
Likely causes
- Intermittent or sustained open/short in sensor signal or ground circuit
- Corroded/loose connector at the IAT sensor
- Sensor contaminated by oil/moisture causing incorrect resistance
- Wiring damaged between sensor and ECM
- ECM input circuit fault (less common)
Fault status
Status
Intake Air Temperature Sensor 2 (Bank 2) circuit out of range/performance fault
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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